Automatic cut-off for gas appliances



C-i- F.v SCHWARTZ u'romu'm CUT-OFF FOR GAS APPLIANCES Filed 00%.. 28. 1922 dahwartz azu zff.

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Patented July 8, 1924. jw.v r

STATES- cnnmnnr F. sorrwanrrz, on ST. Louis, MISSOURI;

AUTOMATIC CUT-OFF FOR GAS APPLIANCES.

Application filed October 28, 1922. Serial No. 597,568. 1

SCHWARTZ, a citizen of" the United States, and resident of St. Louis, in the State of Missouri',-have invented certain new and useful Improvements in Automatic Cut-Offs for Gas" Appliances, of which the following is The present invention relates to improvements inautomatic cut oils for gas appliances and has for an object to provide. for the closing of the gas controlvalve which regulates the supply of gas to the pilot burner','-.whenever the latter, for any reasons, becomes extinguished. I V 7 r Otherobjectsof the invention lie in the provision of coordinate parts and devices assembled in'a relatively compact structure and cooperating in'an efficient manner to secu're the quick and positive closing of the pilot valve, to provide such parts asare adjustable to meet -various conditions encountered in the structure and arrangement of different characters of automatic appliances and to enable the resetting of the parts with a greater facilitythan has'been heretofore possible and to so constructvand arrange" the parts that casual closing of. the valve is practically impossible. V

The invention will be found to be of'use particularly in connection with automatic gas appliances in general such: as automatic gas water heaters, gas furnaces, gas steam boilers, radiators, gas stoves,etc. .and the device accommodates itself to various positions of the pilot cut off valve'encountered I in these several appliances.

With the foregoing and other objects in view, theinvention will be more fully described hereinafter, and will be more partioularly pointed out in the claims appended hereto.

'In the drawings, wherein likesymbols refer to like or corresponding parts throughout the several views,

a Figure 1 is a side view of a pilot burner, pipe and valve withthe improvement shown in connection therewith.

Figure 2 is a fragmentary view of the vertical portion of the gas pipe showing the thermostat at substantially right angles to Figure 1, and

Figure 3 is a vertical section taken through the horizontal portion or the feed pi e adjacent the control valve.

' GfGII'lIlgIIlOIB particularly to the drawings,,:5' designates the pipe or tube conveying-gas from an appropriate source of'supply to theflpilot tip or burner 6 and 7 represents the control valve situated in the horizontal portion of the pipe 5 and having the handle or operating arm 8 by which the valve is moved to an open or closed position and toregulate the quantity of gas flowing to the burner 6. v

In accordance with the invention a therniostatic bar 9 is provided upon the vertical portion of the supply pipe and to cooperate with the trigger 10 pivoted at 11 upon the pipe or a suitable support and being made with the recessed shoulder 12 at one sideto receive thefree lower end of the thermostat, which maybe made from a strip of brass metal amalgamated to a strip of steel. The upper end of the thermostatic bar 9 is received between the flanges 13 bent radially froma collar14 clamped about the supply pipe beneath and adjacent the burner tip 6.

arcane This sleeve may be of'cast brass or other material found appropriate for the purpose and the flanges and the portion of the bar{ 9 lying therebetween are secured. together by'the screws or otherfastenings 15.

The trigger 10 is made with a projection 16 extending oppositely to the shoulder 12 and-having a notched upper portion to receive and retain the loop 17 upon the end of the cord or flexible element 18. This element is employed to sustain the weight 19 provided to close the valve 7and the weight is particularly connected to an end of the flexible element just after passing slidably throughthe opening 20 made in the valve handle 8. The cord carries a button or stop .21-fixed thereon and normally lying spaced an appreciable distance above the valve handle as for instance shown in Figure 1 and suitably below a grooved wheel or pul- Figure 1, the thermostatic bar 9 is heated and in this condition warped into contact with the trigger 10, its free end lying engaged in the recessed shoulder 12. The loop 17 is engaged with the projection 16 and the weight 19 is suspended with the valve arm 8 in the raised horizontal position.

Should the flame however become extinguished accidentally the thermostatic bar 9 3 mally held in the potential position by this set arrangement of the parts, will be free to descend and to carry with it the cord 18 and the connecting button or stop 21. Now the stop is sufiiciently large to avoid its passing through the opening 20 in the valve handle 8, which it therefore strikes; The button being initially spaced above the valve handle, will permit of the weight acquiring a considerable momentum before any connection between the weight and the valve arm is established. This is desirable for the reasons that the valve sometimes sticks and the valve handle is only turned by the application of considerable force which thedormant condition of the'weight could not dislodge. I I

The button or stop acted on by the weight will swing the arm 8 downwardly with the weight until the valve 7 is tightly closed and the flow of gas completely shutoff. The construction above described is particularly advantageous as it admits of the relighting of the pilot and the restoration of the trigger, thermostat and weight to the locked and initial condition. The device-has the further advantage that the clamp collar 24 may be adjusted along the pipe-5 near to or further from the trigger but may be situated relatively to the valve wherever this may occur in various" -structures and by the simple expedient of varying the cord 18 to suit the new conditions, the device may be applied and adjusted to any of the valve for controlling the supply of gasto the burner, valve-closing means, a movable, I

trigger, a flexible connection adapted to de tachably engage the trigger and connected to the valve closing means for normally holdingthe latter in a potential condition, and :a thermostat placed relatively to the burner and when heated, in the au r movement of the trigger for preventing the movement of the trigger and theValve-clOS-v ing means, said thermostat adapted towarp out of engagement with the trigger when cold andpermitmovementof the same.

- 2. In a gas .control for automatic appliances,-'the combinationof a pilot burner, a valve for controlling the supply of gas to the burner,- weight means for, closing said valve, a rotary trigger, a fiexible connection havingreleasable engagement with the trigger for normally holding the weight elevated, and a thermostat placed relatively to the burner and releasably engaging the trigger in the heated condition of-the thermo- I stat.

In a safety control for automatic gas appliances, the combination oi a pilot burner, a valve for controlling the supply of gas to the burner, a weight fonclosing said/ valve, a flexible connectionjfcarrying said weight and having means for acting upon-the valve only after the weight has -aequir'ed'mon1entum,-,a movable trigger releasably engaging-said flexible connection to hold the weight suspended and a thermostat engaging in the heated condition' said trigger but adapted to react when. coldjand disengage the trigger to enable the weight to falli I e In testimony that I claim the foregoing as In invention I have si ned m name y e y hereunder. V GERHARDT F. SCHWARTZ. 

